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可加工B4C/BN复相陶瓷的制备及其高温抗氧化性能

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Abstract:

采用热压烧结工艺制备单相B4C陶瓷、B4C/BN微米复相陶瓷和B4C/BN纳米复相陶瓷。研究了其在1000~1300℃的等温氧化性能,通过对氧化后试样表面的物相组成和显微结构的分析,探讨了氧化机理。结果表明单相B4C陶瓷、B4C/BN微米复相陶瓷和B4C/BN纳米复相陶瓷的高温抗氧化性能随氧化温度提高和氧化时间增加而逐渐降低,试样氧化过程中质量损失逐渐明显。对试样在不同氧化温度下得到的氧化曲线进行了线性拟合分析,试样在1000℃时抗氧化性能较好,但在1300℃时抗氧化性能较差。氧化后试样表面的物相组成主要为B4C相、h-BN相,以及少量的B2O3相和Al4B2O9或Al18B4O33相。氧化后试样表面存在一层厚度约为100μm的氧化层,氧化层中存在许多微孔和少量玻璃相物质。氧化生成的B2O3挥发是导致试样质量随着氧化温度和氧化时间增加而显著减少的主要原因。

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